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          <h1 class="post-title" itemprop="name headline">Spring Boot集成Jetcache</h1>
        

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        <h3 id="Spring-Boot集成Jetcache来实现缓存"><a href="#Spring-Boot集成Jetcache来实现缓存" class="headerlink" title="Spring Boot集成Jetcache来实现缓存"></a>Spring Boot集成Jetcache来实现缓存</h3><a id="more"></a>
<h1 id="一、JetCache"><a href="#一、JetCache" class="headerlink" title="一、JetCache"></a>一、JetCache</h1><p>JetCache是一个基于Java的缓存系统封装，提供统一的API和注解来简化缓存的使用。 JetCache提供了比SpringCache更加强大的注解，可以原生的支持TTL、两级缓存、分布式自动刷新，还提供了Cache接口用于手工缓存操作。 当前有四个实现，RedisCache、TairCache（此部分未在github开源）、CaffeineCache(in memory)和一个简易的LinkedHashMapCache(in memory)，要添加新的实现也是非常简单的</p>
<p>全部特性:</p>
<ol>
<li>通过统一的API访问Cache系统</li>
<li>通过注解实现声明式的方法缓存，支持TTL和两级缓存</li>
<li>通过注解创建并配置Cache实例</li>
<li>针对所有Cache实例和方法缓存的自动统计</li>
<li>Key的生成策略和Value的序列化策略是可以配置的</li>
<li>分布式缓存自动刷新，分布式锁 (2.2+)</li>
<li>异步Cache API (2.2+，使用Redis的lettuce客户端时)</li>
<li>Spring Boot支持</li>
</ol>
<h1 id="二、示例-Spring-Boot"><a href="#二、示例-Spring-Boot" class="headerlink" title="二、示例(Spring Boot)"></a>二、示例(Spring Boot)</h1><ol>
<li><p>添加pom依赖</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;org.projectlombok&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;lombok&lt;/artifactId&gt;</span><br><span class="line">    &lt;version&gt;1.16.10&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;com.alicp.jetcache&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;jetcache-starter-redis&lt;/artifactId&gt;</span><br><span class="line">    &lt;version&gt;2.5.9&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br><span class="line"></span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>
</li>
<li><p>配置</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">jetcache:</span><br><span class="line">  statIntervalMinutes: 15</span><br><span class="line">  areaInCacheName: false</span><br><span class="line">  local:</span><br><span class="line">    default:</span><br><span class="line">      type: caffeine</span><br><span class="line">      keyConvertor: fastjson</span><br><span class="line">  remote:</span><br><span class="line">    default:</span><br><span class="line">      type: redis</span><br><span class="line">      keyConvertor: fastjson</span><br><span class="line">      valueEncoder: java</span><br><span class="line">      valueDecoder: java</span><br><span class="line">      poolConfig:</span><br><span class="line">        minIdle: 5</span><br><span class="line">        maxIdle: 20</span><br><span class="line">        maxTotal: 50</span><br><span class="line">      host: 127.0.0.1</span><br><span class="line">      port: 6379</span><br><span class="line">      password: redis-password</span><br></pre></td></tr></table></figure>
</li>
<li><p>启动类</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">@SpringBootApplication</span><br><span class="line">@EnableCreateCacheAnnotation</span><br><span class="line">@EnableMethodCache(basePackages = &quot;com.boot.example&quot;)</span><br><span class="line">public class JetCacheApplication &#123;</span><br><span class="line"></span><br><span class="line">    public static void main(String[] args) &#123;</span><br><span class="line">        SpringApplication.run(JetCacheApplication.class, args);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>控制器</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line">@RestController</span><br><span class="line">@RequestMapping(&quot;/users&quot;)</span><br><span class="line">public class UserController &#123;</span><br><span class="line"></span><br><span class="line">    @Autowired</span><br><span class="line">    private UserService userService;</span><br><span class="line"></span><br><span class="line">    @RequestMapping(&quot;/&#123;id&#125;&quot;)</span><br><span class="line">    public User getUser(@PathVariable(&quot;id&quot;) Integer id) &#123;</span><br><span class="line">        return userService.getUser(id);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @RequestMapping(&quot;/getUserFromMethodCache&quot;)</span><br><span class="line">    public User getUserFromMethodCache() &#123;</span><br><span class="line">        return userService.getUserFromMethodCache(10006);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @RequestMapping(&quot;/delete&quot;)</span><br><span class="line">    public void deleteUser() &#123;</span><br><span class="line">        userService.remove(10006);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @RequestMapping(&quot;/update&quot;)</span><br><span class="line">    public void update() &#123;</span><br><span class="line">        User user = User.builder()</span><br><span class="line">                .id(10006)</span><br><span class="line">                .name(&quot;update cache&quot;)</span><br><span class="line">                .build();</span><br><span class="line">        userService.updateUser(user);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @RequestMapping(&quot;/getUserFromRefreshCache&quot;)</span><br><span class="line">    public User getUserFromRefreshCache() &#123;</span><br><span class="line">        return userService.getUserFromRefreshCache();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>业务层接口</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">public interface UserService &#123;</span><br><span class="line"></span><br><span class="line">    @Cached(name = &quot;UserService.getUserFromMethodCache&quot;, expire = 100, cacheType = CacheType.BOTH, key = &quot;#id&quot;)</span><br><span class="line">    User getUserFromMethodCache(Integer id);</span><br><span class="line"></span><br><span class="line">    User getUser(Integer id);</span><br><span class="line"></span><br><span class="line">    @CacheUpdate(name = &quot;UserService.getUserFromMethodCache&quot;, key = &quot;#user.id&quot;, value = &quot;#user&quot;)</span><br><span class="line">    void updateUser(User user);</span><br><span class="line"></span><br><span class="line">    @CacheInvalidate(name = &quot;UserService.getUserFromMethodCache&quot;, key = &quot;#id&quot;)</span><br><span class="line">    void remove(Integer id);</span><br><span class="line"></span><br><span class="line">    @Cached(name = &quot;UserService.getUserFromRefreshCache&quot;, expire = 10, cacheType = CacheType.BOTH)</span><br><span class="line">    @CacheRefresh(refresh = 2, stopRefreshAfterLastAccess = 100)</span><br><span class="line">    User getUserFromRefreshCache();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>业务实现</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">@Service</span><br><span class="line">@Slf4j</span><br><span class="line">public class UserServiceImpl implements UserService &#123;</span><br><span class="line"></span><br><span class="line">    @CreateCache(name = &quot;UserService.getUser&quot;, expire = 100, cacheType = CacheType.BOTH)</span><br><span class="line">    private Cache&lt;Integer, User&gt; userCache;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public User getUser(Integer id) &#123;</span><br><span class="line">        User user = userCache.get(id);</span><br><span class="line">        if (Objects.isNull(user)) &#123;</span><br><span class="line">            log.info(&quot;&lt;&lt;&lt;缓存中不存在&gt;&gt;&gt;&quot;);</span><br><span class="line">            User user1 = User.builder()</span><br><span class="line">                    .id(10001)</span><br><span class="line">                    .name(&quot;测试&quot;)</span><br><span class="line">                    .build();</span><br><span class="line">            userCache.put(id, user1);</span><br><span class="line">            return user1;</span><br><span class="line">        &#125;</span><br><span class="line">        log.info(&quot;&lt;&lt;&lt;从缓存中获取&gt;&gt;&gt;&quot;);</span><br><span class="line">        return user;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public User getUserFromMethodCache(Integer id) &#123;</span><br><span class="line">        return User.builder()</span><br><span class="line">                .id(10002)</span><br><span class="line">                .name(&quot;test cache method&quot;)</span><br><span class="line">                .build();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public User getUserFromRefreshCache() &#123;</span><br><span class="line">        return User.builder()</span><br><span class="line">                .id(10003)</span><br><span class="line">                .name(&quot;test refersh cache&quot;)</span><br><span class="line">                .build();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public void updateUser(User user) &#123;</span><br><span class="line">        System.out.println(&quot;修改用户信息&quot;);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    @Override</span><br><span class="line">    public void remove(Integer id) &#123;</span><br><span class="line">        System.out.println(&quot;删除用户信息&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>实体类</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line">@Data</span><br><span class="line">@Builder</span><br><span class="line">@NoArgsConstructor</span><br><span class="line">@AllArgsConstructor</span><br><span class="line">@ToString</span><br><span class="line">public class User implements Serializable &#123;</span><br><span class="line"></span><br><span class="line">    private Integer id;</span><br><span class="line"></span><br><span class="line">    private String name;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<h1 id="三、讲解"><a href="#三、讲解" class="headerlink" title="三、讲解"></a>三、讲解</h1><p>@EnableCreateCacheAnnotation注解用来激活@CreateCache注解</p>
<p>@EnableMethodCache注解用来激活@Cached注解</p>
<p>接口层@Cached注解中的key和value有使用到#id这样的SPEL表达式，那么需要添加如下配置<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">&lt;plugins&gt;</span><br><span class="line">    &lt;plugin&gt;</span><br><span class="line">        &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;</span><br><span class="line">        &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;</span><br><span class="line">        &lt;version&gt;3.1&lt;/version&gt;</span><br><span class="line">        &lt;configuration&gt;</span><br><span class="line">            &lt;compilerArgument&gt;-parameters&lt;/compilerArgument&gt;</span><br><span class="line">            &lt;encoding&gt;UTF-8&lt;/encoding&gt;</span><br><span class="line">            &lt;source&gt;1.8&lt;/source&gt;</span><br><span class="line">            &lt;target&gt;1.8&lt;/target&gt;</span><br><span class="line">        &lt;/configuration&gt;</span><br><span class="line">    &lt;/plugin&gt;</span><br><span class="line">&lt;/plugins&gt;</span><br></pre></td></tr></table></figure></p>
<h1 id="四、缓存更新问题"><a href="#四、缓存更新问题" class="headerlink" title="四、缓存更新问题"></a>四、缓存更新问题</h1><p>先更新数据库，然后再使缓存失效，没有提供重试机制<br><a href="https://github.com/alibaba/jetcache/issues/115" target="_blank" rel="noopener">请问jetcache @CacheUpdate 更新缓存的策略是什么？</a></p>
<h1 id="五、二级缓存更新问题"><a href="#五、二级缓存更新问题" class="headerlink" title="五、二级缓存更新问题"></a>五、二级缓存更新问题</h1><p>服务是一个集群，存在A、B两个服务，A服务在更新缓存的时候只会更新本机缓存和远程redis缓存，并不会去更新服务B的本地缓存。</p>
<h1 id="六、缓存刷新问题"><a href="#六、缓存刷新问题" class="headerlink" title="六、缓存刷新问题"></a>六、缓存刷新问题</h1><p>假如设置的缓存刷新时间间隔为10s，刷新数据需要耗时5s，那么在10~15之间访问该接口返回的还是旧数据</p>
<h1 id="七、个人疑惑"><a href="#七、个人疑惑" class="headerlink" title="七、个人疑惑"></a>七、个人疑惑</h1><ol>
<li>关于@CacheUpdate、@CacheRefresh、@CacheInvalidate的原理</li>
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#Spring-Boot集成Jetcache来实现缓存"><span class="nav-number">1.</span> <span class="nav-text">Spring Boot集成Jetcache来实现缓存</span></a></li></ol></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#一、JetCache"><span class="nav-number"></span> <span class="nav-text">一、JetCache</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#二、示例-Spring-Boot"><span class="nav-number"></span> <span class="nav-text">二、示例(Spring Boot)</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#三、讲解"><span class="nav-number"></span> <span class="nav-text">三、讲解</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#四、缓存更新问题"><span class="nav-number"></span> <span class="nav-text">四、缓存更新问题</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#五、二级缓存更新问题"><span class="nav-number"></span> <span class="nav-text">五、二级缓存更新问题</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#六、缓存刷新问题"><span class="nav-number"></span> <span class="nav-text">六、缓存刷新问题</span></a></li><li class="nav-item nav-level-1"><a class="nav-link" href="#七、个人疑惑"><span class="nav-number"></span> <span class="nav-text">七、个人疑惑</span></a></div>
            

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